Joseph xemtedy



Patented Nov.

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JOSEPH KENNEDY, OF NEW YORK, N. Y., ASSIGNOR TO 3'. EDWARD OGDEN, OF

' MOUNTAINVILLE, NEW YORK.

, EXPANSION-ANCHOR.

incense.

My invention relates to expansion anchors for bolts and it object is toprovide a sim' ple and inexpensive structure by means of which bolts maybe securely fastened to material of such character that their threadswill not satisfactorily engage therewith. More specifically, its objectis to provide a structure which under longitudinal pressure willcollapse longitudinally alon predetermined transverse lines to there yexpand outwardly against the wall of a hole in which it is placed andcontract inwardly against the bolt it is designed to hold.

In order-that my invention may be thoroughly understood 1 will nowproceed to describe the same in the following specification, and thenpoint out the novel features thereof in appended claims.

Referring to the drawings:

Figure 1 is a sectional longitudinal elevation of an expansion. anchormade according to and embodying my invention shown inserted in a holebefore expansion and with a bolt in position.

Fig. 2 is a similar view of the same parts in the positions they assumeafter expansion.

Fig. 3 is a sectional elevation of a modified form of my invention.

Figs. 4, 5, 6 and 7 are fragmentary sec tional elevations illustratingmodifications of construction of a'bolt anchor of the type shown in Fig.3. I

Fig. 8 is a sectional elevation of a still further modification ofstructure.

Fig. 9 is an elevation of an anchor which constitutes an embodiment ofmy invention and is a modification of those shown in Figs. 1 and 2.

Like characters of reference designate corresponding parts in all thefigures.

'10 designates a bolt. in Figs. 11 and 2, 11 is a metallic tubesurrounding thi bolt circumferentially, that is, the metal of the tubeis continuous and unbroken by longitudinal slots. The tube has aninternal 5 diameter slightly larger than the diameter Specification ofLetters Patent.

forming a part thereof...

wall of the hole.

a is provided with cast or out threads 21.

Patented Nov. 4t, lliiltl.

Applimtion filed. June 16, 1917. Serial no. 175,053.

of the bolt. At the inner end of the tube threads 12 are rolled intotube in such a way as to reduce the diameter of the tube at this partand of such size and pitch as to fit the threads of the bolt.

The rest of the tube i creased and crimped inwardly at preferablyequally spaced distances as at 13 but these crimps are not deep.

enough to interfere with the insertion of the bolt. Between the lines 18the tube is creased and crimped outwardly as at 14-.

Before describing specifically the structure illustrated in the otherfigures of the, drawings,'1 will point out the manner in which thisdevice is used. A hole is drilled in a wall 15, for example, ofsufficient depth and diameter to receivethe tube shows in Fig. 1. 16 isan object which is to he fastened to the wall. The bolt 10 is passedthrough the object and through the tube into the threads 12. Tighteningthe bolt will put longitudinal pressure upon the tube which willcollapse under this pressure along lines predetermined by the creases l3and M. This will increase the crimps in the 09 metal which will thushave a tendency to fold up like an accordion. The inward displacement ofthe metal at the lines 13 is of course limited by the shank of the bolt,and this limitation will assist in forcing the metal ed the tube at thelines 14 into the lhus a firm anchorage with the wall isformed and atthe same SOl that the latter has no clearance and is incapable oflateral movement- .which might in time loosen the anchorage. The partswill have assumed some such positions as e those illustrated in Fig. 2.

in the structure shown in Fig. 3, the tube 11 is made of thicker metal.it is constructed with a clearance hole 20 for the bolt 10. its innerend is of smaller diameter and nut spaced intervals grooves 22 are cuttransversely through the inner surface of the bore 20. Between thesegrooves others designated 23 are cut in the outer surface. These grooves22 and 23 are of sufiicient depth. dependent upon the kind of metal ofwhich the tube is made to insure its buckling in and out whensubjected-to longitudinal pressure produced by turning the bolt in thethreads 21.

It is not necessary to have both inner and ice outer grooves. The innergrooves 22 may be I used alone as shown in Flg. 4 or the outer grooves23 may be used. alone as shown in 'Ihe specific means for insuring thecrimping of the metal at desired transverse lines is not an essentialpart of this invention. For example, the tube 11 may have inwardlytapered transverse slots such as 24 in Fig. 6, cut through its surfaceon the desired lines, or the slots may taper outwardly as at 25 in Fig.7, if desired. These transverse slots do not interrupt thecircumferential continuity of the metal.

Fig. 8 shows a transversely corrugated tube 11 of comparatively thinmetal. In

' this case a bolt and nut are illustratedto show that the invention isnot necessarily limited to a structure with threads to be engaged by thethreads of the bolt. In this Fig. 8, the bolt is designated by 30, itshead by 31 and its nut by 32. It may be seen that with this structurescrewing the nut onto thebolt or screwing the bolt intothe nut willproduce longitudinal pressure on the tube, and that this pressure willcause the tube to collapse to displace its metal both inwardly andoutwardly.

The transverse crimps are not necessarily annular in form and may, forexample, be made in the form of a helix as shown in Fig. 9 anddesignated 35. In fact, they may be unevenly spaced and irregular inform if de sired. I a.

I have illustrated and described several structures which embody thisinvention in.

order to show that it is capable of wide structural variation and toshow that I do not intend to limit myself to any specific form'orconstruction. In fact I intend no limitations other than those imposedby the following 'claims.

What I claim is:

1.- A circumferentially continuous tube adapted to receive a bolt andprovided with means to cause the tube to fold on a plurality of spacedtransverse lines'when subjected to a longitudinal pressure.

spaced laterally contracted and expanded portions, and adapted to becrimped onto a bolt and against the walls of a hole in which it isinserted, when subjected to longitudinal pressure.

4:. A circumferentially continuous tube provided near one end withthreads adapted to receive the threads of a bolt inserted through thetube, the unthreaded part of the tube being provided with spacedlaterally contracted and expanded portions,. and adapted to be crimpedonto a bolt and against the walls of a hole in which it is inserted,when subjected to longitudinal pressure 5. A circumferentiallycontinuous tube provided near one end with; a contracted portionconstructed with threads for receiving the threads of a bolt insertedthrough the tube, the unthreaded part of the tube being creased andcrimped inwardly and outwardly and adapted tobe crushed and folded bylongitudinal pressure produced thereon by turning a bolt in said threadsto thereby force the metal of said tube at the inwardly crimped partsthereof onto the bolt and to force the metal thereof at the outwardlycrimped parts against the wall of a hole in which it is inserted.

6. A bolt anchor comprising a circumferentially continuous tubularmember embodying means to cause the member to collapse longitudinallyand expand laterally when subjected to longitudinal pressure.

In witness whereof I have hereunto set my hand this 8th day of June,1917.

. JOSEPH KENNEDY.

Witnesses:

WILLIAM G. DALTON, I. B. Moons.

